Orion is in the US. Celestron mount model designations are a PITA The Celestron German mount #4 is everyone else's EQ-3, Their CG-3 is a EQ-2, etc. You might find an EQ-3 RA drive for $10 less than Orion. It's from Synta and sold elsewhere. Telescope Warehouse has some Synta made Tasco drives for the Vixen Polaris mount. They should work on the CG-4, which is sort of a copy of the Polaris.